Mold for casting metallic articles



(No Model.)

G. E. STEVENS.

MOLD FOR CASTING META LIG' ARTICLES.

No. 356,669. Patented Jan. 25., 1887.

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CHARLES E. STEVENS, OF SOMERVILLE, MASSACHUSETTS.

MOLD FOR CASTING METALLIC ARTlCLES.

SPECIFICATION "forming part of Letters Patent No. 356,669, dated January 25, 1887.

Application filed Decembzr 7, 1885.

To all whom it may concern.-

Be it known that I, CHAR-LES E. STEVENS, of Somerviile, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Molds for Casting MetalArticles, of which the following is a specification.

My invention relates to molds for casting metal articles, and more particularlyto molds for casting window and sash balance-weights, its object being to provide an improved permanent metallic mold whereby such weights and similar articles may be readily and conveniently cast.

To the foregoing ends my invention consists in the improvements as hereinafter i'ully described, and subsequently pointed out in the claim. Of the drawings accompanying this specification and forming a part hereof, Figure 1 represents a top plan view of the lower section of my mold. Fig. 2 represents a bottom plan view of the upper section of my mold. Fig. 3 represents avertical section of the complete mold, taken on the line :0 m, Fig. 1.

Similar letters of reference indicate corre sponding parts in all the figures.

I form my mold in two parts or sections, a representing the upper section, and I) the lower section. In each of these sections parts of the pattern-cavities c are formed in such manner as that substantially one half of each cavity shall he formed in one section and the other half in the other sect-ion, and when the two sections are brought together the fractional parts of each of such cavities will coincide or register with the other parts and form a complete series of pattern-cavities. I mention a series of patterncavities, for the reason that a number of castings may be made at a single operation quite as readily as one;

Serial No. 184,939. (No model.)

the lower section, b, of the mold. These airvents extend oblique] y from the pattern-cavities upward along the line oi junction of the two sections to the upper edge of the end of the mold.

By placing the air-vents at the end of the mold opposite to that in which the receiving aperture is formed the air is completely driven out of the patterncavities at a point at which it will most naturally seek escape, and perfect castings at each operation are secured, which is not the case where the venting takes place through the crevices or along the meeting surfaces of the parts of the molds. 4

The pattern-cavities, as the term indicates, are made of the proper form or shape to have the metal poured therein form the desired casting. In the present case the pattern is designed, as stated, to form window and sash balance-weights, in the main or body portion of which the body of the weight is formed.

9 represents a stud or projection near the lower end, 0, in each cavity, formed on the upper section of the mold, which stud or projection rests against one end of a projection or rib, 71 on the lower mold. Said projection or rib 72- extends from said stud g to the lower end of the pattern-cavity. An eye for fasten ing the suspendingcord of the weight is thus formed by the stud 5/, while theprojection or rib It forms a slot in which said suspendingcord may rest without danger from wear or abrasion when in use.

Small channels i communicate with the lat eral supplychannel (Z and the pattern-cavity c, and at the other end said pattern-cavities communicate with the air-vents f by means of the small channelsj.

Any desired number of pattern-cavities c, with their communicating or connecting chan nels and air-vents, may be constructed in a single mold.

The manner of using my device, which is, as'mentioned, preferablyconstructed of iron, will now be easily understood. The two sections a and Z; are placed together, so that the pattern-cavities, &c., will coincide or register, and the molten metal is poured into the receivingaperture e. The lateralpassage (Z and communicating passages i permit of the proper IOO and equal distribution of the metal throughout the series of pattern-cavities, Whilethe air in such cavities is forced out through the passages j and vents f at the opposite ends of the mold, and all liability of molding defective Weights, as hereinbefore mentioned,is avoided, and perfect castings are formed. When the metal has cooled sufiiciently, l'he uppersection, a, of the mold is removed, the castings taken out, and the part formed in the passage 2' and j and. partsadjacent are broken off.

It will be noticed thahin addition to placing air-vents at the end of the mold opposite to that at which the receiving or pouring aperture is formed, each pattern-cavity is provided with an individual air-vent, which construction is to be regarded as an important feature of my invention, since it provides against the possibility of the chilling and clogging of the metal in one mold, preventing the air from escaping from another or others into which 'metal is poured,,as is the case in molds pro- In testimony whereofI have signed my name i to this specification,in the presence of two sub-' scribing witnesses, this 3d day of December, 1885.

CHARLES E. STEVENS.

Vitnesses: W. A. BARTLETT, O. F. BROWN. 

